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문상재 한국정보보호학회 2009 情報保護學會誌 Vol.19 No.2
경북대학교 이동네트워크 정보보호기술 연구센터(Mobile Network Security Research Center, MSRC)는 2000년 8월 네트워크 분야의 IT 연구센터(지식경제부지정 ITRC)로 선정되어 2008년 12월까지 8년 4개월간의 연구센터로서의 연구, 개발, 인력양성 활동을 성공적으로 수행하였다. 경북대학교 문상재 교수를 중심으로 POSTECH, 부경대학교, 호서대학교, 동서대학교, 경남대학교 등 6개 대학 연간 11 여명의 교수진과 57 여명의 대학원생들은 물론, 국내외 정보보호 분야의 외부 전문가와 관련 산업체들의 활발한 협력 연구 활동으로 논문, 특허, 산학협력, 표준화 등의 부분에서 우수한 연구 실적들을 도출하며, 지식경제부의 IT 대학 육성 지원 사업을 성공적으로 마무리 하였다.
位相反轉回路를 使用한 二重平衡變調器의 動作特性에 關한 硏究
文相在 경북대학교 공과대학 1977 工大硏究誌 Vol.6 No.-
位相反轉回路를 使用한 트렌스레스 二重平衡變調器의 變調效率 및 分離度를 解析하고 實驗的으로 고찰하였다. 實驗直가 理論直에 잘 符合하며, 實驗結果 本 變調器의 特性도 良好하다. Modulation efficiency and isolation index of a transformerless double balanced modulator using a phase inverter are analyzed and investigated experimentally. The experimental results are in good agreement with theoretical calculations. Very appreciable characteristics of the modulator also are observed from experimental results.
文相在,朴成漢 경북대학교 공과대학 1975 工大硏究誌 Vol.4 No.-
In the analysis of locking range in an injection locked oscillator, Adler's differential equation is generally used. The equation is derived under the assumption that the amplitude of an injecting signal is very small compared to the oscillator signal. This paper has derived the general locking equation for an injection locked oscillator. With the aid of the equation, the injection locking range has been investigated. The experimental results have been nearly consistant with the theoretical results.
문상재,하재철 경북대학교 전자기술연구소 1996 電子技術硏究誌 Vol.17 No.1
In this paper, we make an analysis of the ID-based cryptosystems and propose a new cryptosystem to integrate digital signature and key distribution using Moon's digital signature scheme. Two interactive key distribution schemes are proposed with indirect or direct authentication. In addition, we propose one-pass key distribution scheme with mutual authentication for the E-mail typed communication. These schemes are secure based on the discrete logarithm problem and efficient in computation and implementation.
文相在,崔興文,尹秉柱 慶北大學校 1988 論文集 Vol.46 No.-
The APC/SQ algorithm is U.S. government standard of speech compression scheme that is used in the implementation of the STU-II and STU-IIM secure voice systems operating at 9.6kbps. We develop a program for computer simulations of the algorithm. Performance ol the algorithm is examined based on SNR, waveform tracking and voice quality. Results obtained in this work would be useful for developing a new speech compression algorithm for voice secure communnications.
문상재,전병철,최진택,남세용 한국낙농식품응용생물학회 2017 한국유가공기술과학회지 Vol.35 No.4
The effects of ultrasonic (1.2~1.7 kJ/g TS) pretreatment on the solubilization of dairy and livestock sludge were separately evaluated to investigate the possibility of recycling dairy sludge as a potential source of organic carbon. Compared to other industrial wastewater and sewage sludge, dairy sludge has higher organic matter content and no toxic materials. The solubilization rates of dairy and livestock sludge, at a specific energy input of 1.7 kJ/g TS, were 14.5% and 10.6%, respectively. After the 90-minute ultrasonic treatment, the soluble COD (chemical oxygen demand) increased about 7.1 times that of the initial SCOD, at an increase rate of 0.022 m-1. In comparison, the increase in soluble nitrogen, which was ~3.4 times that of the initial soluble nitrogen concentration, was much smaller than the increase in SCOD; thus, the C/N ratio increased from 4.0 to 8.7.